Antonyms of adj sure

9 senses of sure

Sense 1
certain (predicate) (vs. uncertain), sure (vs. unsure) -- (having or feeling no doubt or uncertainty; confident and assured; "felt certain of success"; "was sure (or certain) she had seen it"; "was very sure in his beliefs"; "sure of her friends")

uncertain (vs. certain), unsure (vs. sure), incertain -- (lacking or indicating lack of confidence or assurance; "uncertain of his convictions"; "unsure of himself and his future"; "moving with uncertain (or unsure) steps"; "an uncertain smile"; "touched the ornaments with uncertain fingers")
        => ambivalent -- (uncertain or unable to decide about what course to follow; "was ambivalent about having children")
        => doubtful, dubious -- (fraught with uncertainty or doubt; "they were doubtful that the cord would hold"; "it was doubtful whether she would be admitted"; "dubious about agreeing to go")
        => groping -- (acting with uncertainty or hesitance or lack of confidence; "a groping effort to understand")

Sense 2
certain, sure -- (exercising or taking care great enough to bring assurance; "be certain to disconnect the iron when you are through"; "be sure to lock the doors")

INDIRECT (VIA careful) -> careless -- (marked by lack of attention or consideration or forethought or thoroughness; not careful; "careless about her clothes"; "forgotten by some careless person"; "a careless housekeeper"; "careless proofreading"; "it was a careless mistake"; "hurt by a careless remark")

Sense 3
certain (vs. uncertain), sure -- (certain to occur; destined or inevitable; "he was certain to fail"; "his fate is certain"; "In this life nothing is certain but death and taxes"- Benjamin Franklin; "he faced certain death"; "sudden but sure regret"; "he is sure to win")


Sense 4
sure -- (physically secure or dependable; "a sure footing"; "was on sure ground")

INDIRECT (VIA secure) -> insecure, unsafe -- (lacking in security or safety; "his fortune was increasingly insecure"; "an insecure future")

Sense 5
certain, sure -- (reliable in operation or effect; "a quick and certain remedy"; "a sure way to distinguish the two"; "wood dust is a sure sign of termites")

INDIRECT (VIA reliable, dependable) -> unreliable, undependable -- (not worthy of reliance or trust; "in the early 1950s computers were large and expensive and unreliable"; "an undependable assistant")
INDIRECT (VIA reliable, dependable) -> unreliable, undependable -- (not worthy of reliance or trust; "in the early 1950s computers were large and expensive and unreliable"; "an undependable assistant")

Sense 6
sure, trusted -- ((of persons) worthy of trust or confidence; "a sure (or trusted) friend")

INDIRECT (VIA trustworthy) -> untrustworthy, untrusty -- (not worthy of trust or belief; "an untrustworthy person")

Sense 7
sure -- (infallible or unfailing; "a sure (or true) sign of one's commitment")

INDIRECT (VIA true) -> false -- (not in accordance with the fact or reality or actuality; "gave false testimony under oath"; "false tales of bravery")

Sense 8
sure -- (certain not to fail; "a sure hand on the throttle")

INDIRECT (VIA steady) -> unsteady -- (subject to change or variation; "her unsteady walk"; "his hand was unsteady as he poured the wine"; "an unsteady voice")

Sense 9
indisputable, sure -- (impossible to doubt or dispute; "indisputable (or sure) proof")

INDIRECT (VIA certain) -> uncertain -- (not established beyond doubt; still undecided or unknown; "an uncertain future"; "a manuscript of uncertain origin"; "plans are still uncertain"; "changes of great if uncertain consequences"; "without further evidence his story must remain uncertain")

Similarity of adj sure

9 senses of sure

Sense 1
certain (predicate) (vs. uncertain), sure (vs. unsure) -- (having or feeling no doubt or uncertainty; confident and assured; "felt certain of success"; "was sure (or certain) she had seen it"; "was very sure in his beliefs"; "sure of her friends")
       => convinced (predicate), positive (predicate), confident (predicate) -- (persuaded of; very sure; "were convinced that it would be to their advantage to join"; "I am positive he is lying"; "was confident he would win")

Sense 2
certain, sure -- (exercising or taking care great enough to bring assurance; "be certain to disconnect the iron when you are through"; "be sure to lock the doors")
       => careful (vs. careless) -- (exercising caution or showing care or attention; "they were careful when crossing the busy street"; "be careful to keep her shoes clean"; "did very careful research"; "careful art restorers"; "careful of the rights of others"; "careful about one's behavior")

Sense 3
certain (vs. uncertain), sure -- (certain to occur; destined or inevitable; "he was certain to fail"; "his fate is certain"; "In this life nothing is certain but death and taxes"- Benjamin Franklin; "he faced certain death"; "sudden but sure regret"; "he is sure to win")
       => bound (predicate), destined -- ((usually followed by `to') governed by fate; "bound to happen"; "an old house destined to be demolished"; "he is destined to be famous")
       => doomed, fated -- ((usually followed by `to') determined by tragic fate; "doomed to unhappiness"; "fated to be the scene of Kennedy's assassination")
       => foreordained, predestinate, predestined -- (established or prearranged unalterably; "his place in history was foreordained"; "a sense of predestinate inevitability about it"; "it seemed predestined since the beginning of the world")
       => in for (predicate) -- (certain to get or have; "he knew he was in for a licking")
          Also See-> predictable#1

Sense 4
sure -- (physically secure or dependable; "a sure footing"; "was on sure ground")
       => secure (vs. insecure) -- (free from danger or risk; "secure from harm"; "his fortune was secure"; "made a secure place for himself in his field")

Sense 5
certain, sure -- (reliable in operation or effect; "a quick and certain remedy"; "a sure way to distinguish the two"; "wood dust is a sure sign of termites")
       => reliable (vs. unreliable), dependable (vs. undependable) -- (worthy of reliance or trust; "a reliable source of information"; "a dependable worker")

Sense 6
sure, trusted -- ((of persons) worthy of trust or confidence; "a sure (or trusted) friend")
       => trustworthy (vs. untrustworthy), trusty -- (worthy of trust or belief; "a trustworthy report"; "an experienced and trustworthy traveling companion")

Sense 7
sure -- (infallible or unfailing; "a sure (or true) sign of one's commitment")
       => true (vs. false) -- (consistent with fact or reality; not false; "the story is true"; "it is undesirable to believe a proposition when there is no ground whatever for supposing it true"- B. Russell; "the true meaning of the statement")

Sense 8
sure -- (certain not to fail; "a sure hand on the throttle")
       => steady (vs. unsteady) -- (not subject to change or variation especially in behavior; "a steady beat"; "a steady job"; "a steady breeze"; "a steady increase"; "a good steady ballplayer")

Sense 9
indisputable, sure -- (impossible to doubt or dispute; "indisputable (or sure) proof")
       => certain (predicate) (vs. uncertain) -- (established beyond doubt or question; definitely known; "what is certain is that every effect must have a cause"; "it is certain that they were on the bus"; "his fate is certain"; "the date for the invasion is certain")

Synonyms of adv sure

1 sense of sure

Sense 1
surely, certainly, sure, for sure, for certain, sure enough, sure as shooting -- (definitely or positively (`sure' is sometimes used informally for `surely'); "the results are surely encouraging"; "she certainly is a hard worker"; "it's going to be a good day for sure"; "they are coming, for certain"; "they thought he had been killed sure enough"; "he'll win sure as shooting"; "they sure smell good"; "sure he'll come")